Means for impregnating paper with liquid



Oct. 22, 1 935. OBERDORFER 2,018,280

MEANS FOR IMPREGNATING PAPER WITH LIQUID Filed June, 11, 1934 Inueofor Wax Oberaor/er Patented Oct. 22, 1935 UNIT-ED STATES PATENT OFFICE LIQUID Max Oberdorfer, St. Helena, Oreg.

Application June 11, 1934, Serial No. 730,117

1 Claim.

This application is being filed in continuation in part and completion of my application filed Sept. 15, 1931, Serial No. 562,921.

My invention relates to the method of impreg- 5 nating a webspecifically a sheet of paper-with a liquid-specifically a preserving oil-by passing the web thru a calender stack, such as used in a paper making machine, to one or a section of the rolls of which stack the liquid is applied and transferred therefrom to the web. The efflclent impregnation of such a sheet and the even distribution of the oil in the sheet are essential. Improper impregnation is wasteful and detracts from the appearance of the sheet by causing it to have noticeable streaks and spots of oil.

The problem involved is to effect the impregnation of the entire surface of the web uniformly. The mode of application of the liquid to one or a section of the rolls of the stack has heretofore been accomplished by spattering, or spraying the liquid in an atomized state upon one or two rolls of the stack carrying the liquid to the web, or by conveying the liquid to the transfer roll by means of an auxiliary roll receiving a coating of the liquid. The spattering or spraying method, in my opinion, would be preferred, since the conveying of the liquid to one of the rolls of the stack by an auxiliary roll, revolving in a trough of the liquid or otherwise being coated, I have found results in too much liquid being transferred to the web; but I have also found that even the spattering or spraying method does not perform a uniform impregnation of the web or sheet over its entire surface, for no matter how fine the spray or spattered drops may be, they will not be uniform, nor uniformly distributed over the entire periphery of the roll applying the liquid to the web, and as a result the web will not, and cannot be uniformly impregnated with the liquid. The purpose of my invention is to create an atmosphere, that is a vapor of fog, as it were, of the oil or other liquid, and to confine such fog by a suitable housing in close proximity to the peripheral surfaces of one, or preferably two contacting rolls of a stack of rolls, whereby the entire peripheral surface of the roll or rolls exposed in the housing will receive a continuous deposit of a film of the liquid from said fog; and transfer the film so received to the web. In that way the latter will be uniformly impregnated thruout its body with the desired quantity of the liquid; and furthermore, by my invention I am able to control the quantity of the liquid applied to the web.

The details of my method, and the means for carrying my invention into practice are hereinafter fully described with reference to the accompanying drawing, which shows diagrammatically the calender stack section of a paper making machine, and associated devices for carrying my invention into practice.

it represents the calender stack of a paper making machine, and j, a, h and a' are intermediate rolls in the calender stack. c is a roller partly submerged in a trough b of oil, preferably heated, and the roller 0 is caused to rotate at variable speed, relative to the amount of oil it is desired for this roller to pick up from said trough, by means of the belt s and pulley r.

Above the roller 0 is a revolving brush d, rotated in the direction indicated by the arrow, the cir- 15 cumference of this brush it not touching the roller 0. This revolving brush d is driven at a high rate by a belt u and pulley v. w is a housing enclosing the brush d and roller 0. This housing may include the trough b at the bottom for holding the 20 oil. The housing w is open on the side facing the transfer rolls 1, g of the calender stack, whereby the oil vapor represented by e is confined and caused to be deposited on the transfer rolls 1 and g in the form of an attenuated film. irepresents the 5 web or sheet of paper drawn from a supply reel of paper 2 between the rolls a and h, and down around the latter and the roll 7' of the stack and thence on the wind-up reel k.

The rotation of the transfer rolls 1', a on each 30 other aid in the uniform distribution of the film of oil-over the entire circumference and from end to end of the roll 9, by which 'the film of oil is transferred to the sheet of paper.

The sheet 1' in passing between the transfer roll 9 35 and the roll it has all inequalities in its surface ironed out, and simultaneously the thin film of oil carried by the roll 9 is impressed into the sheet and spread evenly over the entire width; and further impregnation and permeation is assisted 40 by the passing of the sheet between intermediate rolls h, 7' of the stack.

I have obtainedvery satisfactory results by having the brush (1 rotate at approximately 400 revolutions per minute, and have found that the quantity of oil with which the web or paper sheet is impregnated may be varied by changing the speed with which the brush d rotates and the speed with which the roller 0 rotates in the trough of oil b, causing the-roll c to acquire a light or heavy coating of the oil. But whatever the variation in the film of oil with which the sheet is impregnated,

I have found that the impregnation will be uniform and free of spots and streaks. N0 means for heating the oil or other liquid, before or after it reaches the trough at the bottom of the houssaid trough, and a brush cylinder rotated at high ing to is shown, but any simple convenient means velocity adjacent to and parallel with, but not may be used. touching, said driven roll, whereby to generate I claim: a continuous current of air of high velocity over 5 Means for uniformly impregnating a web with a the coating of liquid carried by said driven roll, 5

liquid comprising a stack of rolls, a housing inand thus generate a fog of the liquid within said closing one side of the peripheral face of one oi housing and cause the exposed surface of said roll said rolls, means for generating a fog of liquid to receive a continuous deposit of the liquid from within said housing, said means comprising a said fog. v m trough for the liquid, a driven roll rotating in MAX OBERDORFER. m 

